
class test4 {
    public static int bitSum(int n){
        int sum = 0;
        while(n!=0){
            sum += (n%10)*(n%10);
            n/=10;
        }
        return sum;
    }
    public boolean isHappy(int n) {

        int slow=n;
        int fast = bitSum(n);

        while(slow !=fast){
            slow = bitSum(slow);
            fast = bitSum(bitSum(fast));
        }

        return slow ==1;
    }
}